I don't know much about NOVA but Alexander Brothers in Timberville has a great reputation for quality hardwoods and good service. I haven't worked with them but one the guys I know is good friends with Shea.
If you can drive a bit, there are some options:
Timberline Farm Sawmill - Sykesville, MD - limited hours
Fallen Lumber - Halethorpe, MD - by appointment
Camp Small - Baltimore, MD - by appointment
Freestate Timbers - Timonium, MD
Good Woods Lumber - Stewartstown, PA
Frank Thomas Sawmill - Fallston, MD
Groff & Groff - Quarryville, PA
Hearne Hardwoods - Oxford, PA
I've bought from all of these sources and the quality is very good to excellent. The largest (Groff & Hearne) have the greatest selection and services. The others are smaller operations so they have good selection and some services. Camp Small is a source that has some dried lumber but is a great place for logs and they will mill the logs for you - in fact, I'm heading there this afternoon to pickup a zelkova log they milled for me.
There's also Frederick Lumber in Frederick and Exotic Lumber in Annapolis.